KIT - Campus South - Wolfgang-Gaede-Str. 1
Seminar Room 10.01, Bldg. 30.23 (Physikhochhaus)

01.02.2010

Dr. Adam Bednorz
Universität Konstanz, Germany

14:00

Abstract: The charge flow (counting statistics) through mesoscopic junctions is  well described by Bernoulli statistics in the long time limit which  follows from a projective detection model. The problem becomes more  complicated and interesting, when considering the measurement of time- resolved current. It can be resolved in terms of the weak measurement.  The idea is similar to the concept of weak values.
 The outcome of the weak measurement can be interpreted in terms of a  quasiprobability. Namely, the total probability distribution of the  measured values of observables is a convolution of a large, white,  Gaussian detection noise and a quasiprobability (independent of the  detector) - not always positive. It can be measured, if the Gaussian  noise is subtracted by a measurement of the fourth cumulant at high frequencies.